Honing machine



April 20, 1943. D. T. PEDEN HONING MACHINE Filed April '7, 1941 IINVENTOR 2011 145 T 73 1.

ww mm ORNEYS.

Patented A r. 20, 1943 noNmo MACHINE v Douglas T. Peden, Ann Arbor,Mich., assignor to Micromatic Hone Corporation, Detroit, Mich., acorporation of Michigan Application April 7, 1941, Serial No. 387,157

4 Claims.

My invention relates to honing machines, and particularly to ahoning-machine of new and novel construction which finishes a workpieceto accurate dimension while compensating for stone wear, and is acontinuation in part of my application, Serial No. 365,526, filed onNovember 8, 1940.

The machine in the above mentioned application embodied a base on whicha table was supported and reciprocated. A spindle was provided forsupporting a honing tool for movement in rotation and reciprocation.Means were provided for advancing the abrasive stones of the honing toolinto engagement with the wall of the workpiece, after which the abrasivestones were further progressively expanded during the machiningoperation to a predetermined diameter. During the machining operationstone wear occurs, and this was compensated for when the stones werecontracted so as to return them to a position to have the diameter ofthe tool the same as at the beginning of the operation. It will be seenthat, when starting on a honing operation with the stones set in apredetermined diameter,

movement to a desired diameter during a honing operation can be set tocompensate for the wear of the stones which will occur during thevoperation. As pointed out above, this wear is compensated for upon thecollapse of abrasive stones so that they are returned to a position toprovide the same diameter as that of the tool at the beginning of theoperation.

movement of the piston by the stones when fur-' ther pressure is appliedthereto when further expanded; and, in general, to provide a method andmeans for locking 9, piston in position when moved longitudinally of itslength which are positive in operation and economical of manufacture.

Other objects and features of novelty of my invention will be eitherspecifically pointed out or will become apparent when referring, for abetter understanding of my invention, to the following description takenin conjunction with the accompanying drawing, wherein:

Figure 1 is a broken sectional view of a spindle and tool embodyingfeatures of my invention;

Fig. 2 is a sectional view of the structure illustrated in Fig. 1, takenon the line 2--2 thereof;

Fig. 3 is a plan view of the locking mechanism Q illustrated in Fig, 1in unlocked position; and

My present invention relates to an improvement on that illustrated anddescribed in my above mentioned copending application. An element isactuated by the piston as it advances the stones to engage the cylinderwall to positively lock the tool against a tendency to actuate thepiston. The mechanism for expanding the stones thereafter, compensatingfor stone wear when retracting the stones, and the controls therefor,are the same as that referred to in the above mentioned copendingapplication.

Accordingly, the main objects of my invention are: to provide a spindlefor supporting and driving a honing tool which has means for lockingcertain parts thereof when the tool is in initially expanded position;to initially expand a honing tool into contact with the wall of acylinder and lock the initially expanding means against retroactivemovement and thereafter further feed the tool a predeterminedprogressive amount as the honing operation progresses; to expand ahoning tool by a piston which rotates a pin in a sleeve to lock thepiston and prevent a retroactive Fig. 4 is a view of the structureillustrated in Fig. 3, with the parts in locked position.

In Fig. l, I have illustrated a spindle I0 com prising a sleeve l Imounted in a supporting housing l2. The sleeve ll supports a sleeve l3in which a tubular element It is mounted for rotational and reciprocalmovement by a shaft l5 which is secured thereto by a rivet It. Thetubular element M has a portion II which functions as a cylindner foroperating a piston l8 to move the piston axially therewithin. The pistonhas a plunger I! mounted on its forward end from which a pin 2| extendswithin slots 22 in an encompassing sleeve 23.

The plunger I9 contains a central aperture 24, the wall thereabouthaving a pair of diagonally disposed, oppositely directed slots 25through which a pin 26 extends. The pin projects through a pair of slots21 in the sleeve 23, a portion 28,

or which is angularly disposed relative to the axis of the sleeve, whilea portion 28 15 disposed at right angles thereto. The ends of the'pin 26project into apertures in a ball race 3| which is turned thereby andwhich is advanced parallel to the movement of the plunger 24. Anexternal race portion 33 is joined to the portion 3| by balls 34 so thatthe race portion 33 reciprocates therewith.

The race portion 33 is extended to provide sleeve portion 35 containinginternal threads.

36 and journals 3! for supporting the projecting ends 38 of a pluralityof pinions 39 which extend through slots in the sleeve portion 35. Thepinions engage gear teeth 4| on an exterior ball race 42 the tops ofwhich have a thread engaged by the thread 38 of the sleeve portion 15.An

internal raceway 43 is joined to the raceway 42 by a plurality of balls44 secured in thrust relation by a sleeve 45. The raceway 43 has a pin48 projecting therethrough which passes through a slot 41 in the sleeve23 and through an aperture in a supporting head 48 which receives thehead of the adjusting element 49 of the tool 5|.

Inv Fig. 1, I have illustrated the piston I 8 in the left hand end ofthe cylinder II, in which position the adjusting cone 49 of the toolpermits the abrasive stones 5!] to contract. After a workpiece has beenmounted in a holder (not shown) and advanced over the tool, fluid isprovided to the left hand side of the piston 18 to move the piston tothe right and advance the plunger l9 to rotate the pin 26 as it isadvanced in the slot portion-28 and thereafter rotated into the slotportion 29. The initial advancement of the pin in the slot portion 28advances the raceway 3|, the raceway and sleeve portion 33 and 35,

- the raceways 42 and 43, and the pin 46 to thereby advance the head 48and the adjusting cone 49 to initially move the abrasive stones 50 intoengagement with the cylinder wall.

The further movement of the pin 26 in the slot portion 29 provides amechanical lock to prevent pressure on the adjusting cone 49 from movingthe piston to the left. Such pressure may be produced by the furtherexpansion of the stones during the honing operation as the sleeve 52 isrotated to rotate an internal gear, the pinions 39 and the raceway 42which is advanced t the right by the threads 36. The pin 2! in theplunger I9 operates in the slot 22 in the sleeve 23 and prevents therotation of the plunger during the advance movement which forces the pin26 to revolve. After the honing operation, the application of fluid tothe piston I8 is reversed for moving the piston and plunger iii to theleft, which movement revolves the pin 28 in the slot portion 29 tounlock the plunger and then moves it to the left in the slot 28 whichreturns the parts to the position as illustrated in Fig. 1. The abrasiveelements are then out of contact with the finished surface of thecylinder which may be removed from the Work holder.

It will thus be seen that I have provided a positive lock for theplunger and piston of a honing device which moves the abrasive stonesinto and out of contact with a cylinder wall. After the stones have beeninitially advanced, a pin is revolved to lock the piston 'and plunger infixed position. The stones are thereafter further advanced during thehoning operation by mecha nism in addition to the piston and plunger,the latter of which are locked against movement which may otherwiseoccur from the pressure in built up on the stones by the additionalmechanism. The reverse movement of the piston initially releases thelock and retracts the cone which permits the stones to collapse and moveout of contact with the finished surface of the 1.", cylinder.

What I claim is:

1. In a .honing device, a plurality of honing stones, an element forexpanding said stones, a piston for moving said element for expanding :0said stones, and means actuated by the movement of said piston forlocking said piston against reverse movement by said element.

2. In a honing device, a plurality of honing stones, an element forexpanding said stones, a

piston for moving said element for expanding said stones, means actuatedby the movement of said piston for locking said piston against reversemovement by said element, and means for thereafter moving said elementto further expand said 30 stones without moving said piston.

3. In a honing device. a tool having a plurality of honing stones,mechanism for expanding and contracting said stories, a. piston formoving said mechanism for also expanding and contracting 35 said stones,and mean operated by said piston for locking said piston againstmovement by said mechanism when'the latter is operated to expand andcontract said stones.

4. In a honing device, a tool having a plurality g of honing stones,mechanism for expanding and contracting said stones, a piston for movingportions of said mechanism for also expanding said stones, and meansoperated by said piston for locking a part of said mechanism forremoving 45 pressure from said piston produced by the further expansionof said stones by said mechanism.

DOUGLAS T. PEDEN.v

